He said that those going after Mueller and Comey were “using the apparatus of the White House” and the Republican Party to “trash the integrity of a good man.”

“When those tools get used to trash the integrity of two good men, this country’s gone over a cliff,” Himes said.

Trump has slammed Mueller's probe into ties between his campaign and Russia as a "witch hunt" and has raised the possibility of firing Mueller.

The New York Times reported last week that Trump had attempted to fire Mueller last year over a news report that the special counsel was seeking the president's financial records, but backed off after Mueller's team told the White House that the report was inaccurate.

Trump also lashed out at Comey in a pair of tweets early Friday after excerpts of Comey's new book disparaging Trump were released.

James Comey is a proven LEAKER & LIAR. Virtually everyone in Washington thought he should be fired for the terrible job he did-until he was, in fact, fired. He leaked CLASSIFIED information, for which he should be prosecuted. He lied to Congress under OATH. He is a weak and.....

....untruthful slime ball who was, as time has proven, a terrible Director of the FBI. His handling of the Crooked Hillary Clinton case, and the events surrounding it, will go down as one of the worst “botch jobs” of history. It was my great honor to fire James Comey!